What Is A Clock Domain - Agilent Technologies 93000 SOC Series Training Manual

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NO TE
Lesson 3 – Setting up the Digitizers in the Digital Clock Domain

What is a Clock Domain

A clock domain is a region in the testhead that can have its own,
proprietary clock setting, independent of other regions.
Each board (digital channel or analog module) in the testhead
belongs to one or more clock domains.
The settings of a clock domain, that is, the clock frequency, and
also the characteristics of the clock source of a domain, apply to
all boards in the domain.
The following figure shows the clock domains and how digital
channel boards and analog modules are assigned to them.
Digital Clock Domain
•Digital Channel Boards
•Analog Modules
(digitizers, samplers, AWGs*)
* The WGC has its own on-board clock generation, independent of the
domain clocks.
The TIA needs no clock signal from the system
Digital and Analog Clock Domain
There are two clock domains:
The digital clock domain
•
containing all digital channel boards and all analog modules.
The analog clock domain
•
containing all analog modules.
As the analog modules belong to both clock domains, you can
define for each module individually to run either in the digital
clock domain or in the analog clock domain. This means that an
analog module can either be clocked by the clock signal of the
digital domain, or by the clock signal of the analog domain.
Unlike the other Analog Modules, the WGC features an on-board clock
generation. It is independent from the clock of the clock domain
(digital clock domain or analog clock domain).
Analog modules can
choose the clock domain!
Analog
Clock
Domain
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